JPS6345267Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a zigzag sewing machine, in particular to an improvement of a threading device for passing a thread through the eye of a needle of the zigzag sewing machine.

(Prior Art) As is well known, in a zigzag sewing machine equipped with a horizontal hook, a needle bar 6 thereof is supported so as to be swingable around a vertical axis, as shown in FIG. Further, in the swinging range of the needle bar 6, the eye hole 5a of the needle 5 attached to the lower end of the needle bar 6 is always kept facing forward no matter where the needle bar 6 is located.

Conventionally, in this type of zigzag sewing machine,
As shown in FIG. 7, a pair of guide pieces 22 are provided at the lower end,
23 and a threading hook 24, and performs the threading operation by rotating around its own axis, the threading rod 14, together with the needle bar 6, has its pivot center O.
It is supported so as to be able to swing about a vertical axis.

Therefore, when the threading rod 14 is threaded while the needle 5 is stopped at the left and right swinging positions as shown by the chain lines in FIG. In some cases, the hook 24 and the needle 5 were damaged due to the collision.

In order to solve the above-mentioned conventional problems, the same applicant has already devised the Utility Model Application No. 58
-There is one numbered 181386. That is, "a thread supported by a needle bar support frame 13 that is swingable around a vertical axis, extends parallel to a needle bar 16 having a needle 15 at its lower end, and has a threading hook 28 fixed to its lower end. A threading bar 24 and a threading bar support frame 20 that supports the threading bar 24 so that the threading bar 24 can rotate about its own axis and move up and down relative to the needle bar 16. In a zigzag sewing machine equipped with a threading device, the threading rod 20 is arranged so as to be swingable around the needle bar 16, and the threading rod 20 is arranged to be swingable around the needle bar 16, and threading the needle bar 16 in the direction of lateral swing movement of the needle bar 16. A regulating body 37 is fixed to the needle bar 16 to regulate the position of the bar so that the relative positional relationship between the eye hole 15a of the needle 15 and the threading hook 28 is maintained constant. There is a "threading device."

(Problems to be Solved by the Invention) However, in the conventional device described above, the needle bar has a structure that fits and engages with the bifurcated portion 38 formed on the regulating body 37 and the outer peripheral surface of the threading rod 24. 1
6 may cause sliding noise to occur between the forked portion 38 and the threading rod 24, or due to the swinging of the needle bar 16, the forked portion 38 and the threading rod 24 may There were problems such as a rattling sound during the process.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, in this invention, the needle is supported by a needle bar support frame that is swingable around one vertical axis, and the needle is mounted at the lower end. An attached needle bar, a threading bar that extends parallel to the needle bar and has a threading hook fixed to its lower end, and the threading bar rotates around its own axis and rotates relative to the needle bar. A zigzag sewing machine comprising: a threading bar support frame supporting a threading bar so as to be able to move up and down relative to each other; and a position setting device operable to set a swinging position of the needle bar. a swinging lever that is swingable about a vertical axis remote from a swinging axis of the bar support frame and operatively connected to the positioning device; and for coupling the needle bar support frame and the swinging lever. one end is connected to a portion on the needle bar support frame where the axis of the needle bar is located, and the other end is connected to the swing axis by a distance equal to the distance between the swing axis of the needle bar support frame and the needle bar. a connecting rod connected to a portion on the swinging lever remote from the swinging axis of the swinging lever; The threading rod support frame is fixed to the other end of the rod.

(Function) Therefore, the position setting device, the swing lever,
When the needle bar is swung left and right via the connecting rod and the needle bar support frame, the threading rod remains substantially parallel to the needle bar in the left and right direction via the connecting rod and the threading rod support frame. moved in the state.

Therefore, even when the needle bar is stopped at the left and right swinging positions, the relative positional relationship between the needle eye of the needle bar and the threading hook of the threading bar is maintained constant.

(Embodiment) An embodiment of this invention will be described below with reference to FIGS. 1 to 5.

Part 1 shows the main parts of a zigzag sewing machine from the front.
2, which is a plan view, and FIG. 4, which is a perspective view, a vertical support shaft 3 is disposed on a support member 2 fixed inside a sewing machine frame 1. As shown in FIG.

A needle bar support frame 4 is fitted and supported on the support shaft 3 so as to be able to swing around the axis, and a vertical needle bar 6 with a needle 5 attached to the lower end is attached to the needle bar support frame 4. It is inserted so that it can move up and down. Note that the needle bar 6 is
As shown in the figure, it is connected to a main shaft 10 via a needle bar holder 7, a crank rod 8, and a balance (crank) 9, and is moved up and down by the rotation of the main shaft 10.

A threading bar support frame 11 is disposed on the needle bar support frame 4 so as to be rotatable around the axis of the needle bar 6. The threading rod support frame 11 includes a vertical rod 11a parallel to the needle bar 6, an upper support piece 11b and a lower support piece 1 that project horizontally from both upper and lower ends of the vertical rod 11a.
1c, and is formed in a substantially U-shape when viewed from the front. The tip of the upper support piece 11b is
It is rotatably attached to the upper end of the needle bar support frame 4 by a pivot pin 12 co-located with the needle bar 6, while the tip of the lower support piece 11c fits into the outer peripheral surface of the needle bar 6. and is rotatably supported around its axis. Note that the upper support piece 11b and one end of a connecting rod 32, which will be described later, are jointly fastened by the pivot pin 12.

A guide groove 13 is formed in the vertical direction of the vertical rod 11a of the threading rod support frame 11. This guide groove 13
, an operating member 15 for threading the threading rod 14 is provided with a supporting member 15a having a projecting piece on its upper end.
, it is attached by a pin 16 that is slidably fitted into the pivot guide groove 13.

The operating member 15 is always urged upward by the first spring 17 and is moved downward by the operating member 18 to cause the threading rod 14 to thread the thread.
That is, the upper part of the threading rod 14 in the vertical direction parallel to the needle bar 6 is fitted into the operating member 15 so as to be movable up and down as well as rotatable around its axis. Furthermore, the operating member 15 has a spiral or inclined operating groove 2 into which one end portion of an operating pin 19 horizontally penetrates and is fixed to the upper part of the threading rod 14 is fitted in a swingable manner.
0 is formed.

The lower part of the threading rod 14 is connected to the threading rod support frame 11.
The shaft tube 21 is fitted and supported vertically and rotatably on the lower support piece 11c, and is fixed to the lower end of the threading rod 14. A pair of guide pieces 22, 23 and the guide pieces 22, 23 A threading hook 24 located in the middle is fixed. Further, a second spring 25 is interposed between the actuating member 15 and the threading rod 14, which always urges the threading rod 14 downward.

A positioning member 26 is fixed at a boss portion approximately at the center of the needle bar 6 in the axial direction. The outer periphery of the boss portion of the positioning member 26 is in contact with the other end of the operating pin 19 of the threading rod 14.
A positioning piece 26a is provided in a protruding manner to prevent the threading rod 14 from moving downward and to position the needle 5 at a height that allows the threading hook 24 to be inserted into the eye hole 5a of the needle 5. Furthermore, a positioning piece 26 is provided on the outer periphery of the boss portion of the positioning member 26.
An engaging piece 26b is provided above a to protrude across a groove through which the actuating pin 19 can be inserted.

Further, a stopper member 27 is fixed at a height position approximately at the center of the vertical rod 11a of the threading rod support frame 11. This stopper member 27 is provided with a mechanism that, when the needle bar 6 is lowered and the actuating member 15 is accidentally lowered, the thread of the threading rod 14 comes into contact with one end of the actuating pin 19 of the threading rod 14. A step-shaped stopper surface 27a is formed to prevent the threading operation.

The operating member 18 that lowers the threading rod 14 together with the operating member 15 is fitted and supported by a guide shaft 28 disposed on one side of the interior of the sewing machine frame 1 so as to be movable up and down, and is always supported by a third spring 29. and is biased upward. The operating member 18 includes a connecting piece 18a that is fitted into a connecting groove 15c of a fork-shaped engaging portion 15b protruding from the front side of the support piece 15a of the operating member 15, and A protruding operating knob 18b is formed respectively.

The swinging device for swinging the needle bar 6 together with the needle bar support frame 4 in the left and right directions about the support shaft 3 is a pulse motor (corresponding to the position setting device of this invention) capable of forward and reverse rotation, and a swinging device. It is mainly composed of a lever 31 and a connecting rod 32.

The swing lever 31 is mounted so as to be rotatable about a vertical support pin 33 disposed within the sewing machine frame 1 at a position away from the support shaft 3 by a predetermined distance to the right in FIG. It is. The pulse motor 30 fixed in the sewing machine frame 1 is mounted on the outer peripheral surface of the tip of the swing lever 31.
A sector gear 3 that meshes with a pinion 34 at the tip of the output shaft of
5 is formed.

The connecting rod 32 that extends in parallel in the left-right direction has one end (the right end in FIG. 2) connected to the swing lever 3.
1 by a connecting pin 36. The other end of the connecting rod 32 (the left end in FIG. 2)
The needle bar support frame 4 is connected to the needle bar support frame 4 by the pivot pin 12 mentioned above.
The threading rod support frame 11 is rotatably fastened together with the upper end surface of the threading rod support frame 11. Further, the other end of the connecting rod 32 is connected to the threading rod support frame 11 by a connecting bolt 37.
It is fixed integrally on the top surface of.

Moreover, from the center of the support shaft 3 to the pivot pin 1
2 and the distance r2 from the center of the support pin 33 to the center of the connection pin 36.
The arrangement positions of the respective pins are set so that they are equal to each other. Even when the needle bar 6 is in the horizontal swing position, the threading bar 14 is moved from the center of the needle bar 6.
The distance L in the left-right direction to the center of is always kept almost constant.

In this embodiment configured as described above, as shown in FIGS. 1 and 2, the needle 5 of the needle bar 6 is in the raised position and stopped at the center of the horizontal swing width. When inserting the upper thread into the eye hole 5a of the needle 5, the operating member 18 is lowered via the knob 18b against the biasing force of the third spring 29. Then, the actuating member 15 is lowered against the urging force of the first spring 17, and the threading rod 14 is lowered together with the actuating member 15. The operating pin 19 of the threading rod 14 is connected to the positioning piece 2
The threading rod 14 reaches the position where it abuts the upper surface of the
When the threading rod 14 is lowered, the threading rod 14 is moved at that position.
The lowering of the needle 5 is stopped and the eye hole 5a of the needle 5 is positioned at the same height.

After that, the actuating member 15 continues to be lowered against the urging force of the first spring 17 and the second spring 25, so that the actuating pin 19 is moved along the actuating groove 20.
At the same time, the threading rod 14 is rotated about its own axis, and the operating pin 19 is fitted into the groove between the positioning piece 26a and the engagement piece 26b. Then, the threading hook 24 is rotated together with the threading rod 14, whereby the threading hook 24 is moved into the eye hole of the needle 5, as shown by the solid line in FIG.
It enters from the center of the rear side of the hole 5a and projects to both sides of the eye hole 5a.

The actuating member 15 is lowered to a position where the actuating pin 19 touches the upper end of the actuating groove 20 of the actuating member 15, and the tip of the threading hook 24 is brought into the eyelet 5a of the needle 5.
With the upper thread protruding forward by a predetermined amount, the upper thread is passed between the pair of guide pieces 22 and 23, and a part of it is hooked to the threading hook 24.

Thereafter, by releasing the push-down operation of the knob 18b, each of the first, second, and third springs 17, 2
Threading hook 24 by the biasing forces of 5 and 29;
Threading rod 14, operating member 15 and operating member 18
is returned to its original position by operating in the opposite manner to the above, thereby completing threading of the upper thread through the eyelet 5a of the needle 5.

Now, when the swing lever 31 is rotated in the forward and reverse directions around the support pin 33 by the pulse motor (position setting device) 30, the needle bar 6 is rotated along with the needle bar support frame 4 via the connecting rod 32. is swung left and right around the support shaft 3. At this time, the connecting rod 32 is
The threading rod 14 moves substantially parallel in the left-right direction, and integrally with the threading rod 32, the threading rod 14 moves substantially parallel in the left-right direction together with the threading rod support frame 11. Therefore, as shown in FIG. 3, even when the needle bar 6 is stopped at the left and right swing position, the distance L1 in the left and right direction from the center of the needle bar 6 to the center of the threading bar 14,
L2 is always kept substantially constant with the distance L shown in FIG. 2, and the relative positional relationship between the eye hole 5a of the needle 5 and the threading hook 24 is kept constant.

Therefore, even when the needle 5 is in the horizontal swing position as shown by the solid line in FIG. The threading hook 24 is inserted from the center of the rear side of the eye hole 5a of the needle 5 without colliding with the needle 5, and threading is ensured.

Next, referring to FIG. 6 to explain another embodiment of this invention, in this embodiment, it is rotated in forward and reverse directions around a support pin 33 by a pulse motor (position setting device) 30. Swing lever 31 and support shaft 3
The needle bar support frame 4, which is swingably supported about be. Therefore, in this embodiment, even when the needle bar 6 is in the left-right swing position, the distance L in the left-right direction from the center of the needle bar 6 to the center of the threading bar 14 is always kept constant. Note that the other parts are the same as those in the embodiment described above, so the explanation thereof will be omitted.

(Effects of the invention) As described above, according to this invention, when the needle bar is swung in the left-right direction via the position setting device, the swing lever, the connecting rod, and the needle bar support frame, the connecting rod and The threading rod is moved through the threading rod support frame while remaining substantially parallel to the needle bar in the left-right direction.

Therefore, even when the needle bar is stopped at the left and right swinging positions, the relative positional relationship between the needle eye of the needle bar and the threading hook of the threading bar can always be kept constant. can. As a result, collision of the hook with the needle is eliminated, and threading through the eye of the needle can be ensured, and unlike conventional methods, the generation of sliding noise and rattling noise between the needle bar and the regulating body is also eliminated. The effect is that it can be done.

[Brief explanation of drawings]

Figures 1 to 5 of the drawings show an embodiment of this invention. Figure 1 is a front view showing the main parts of a zigzag sewing machine, Figure 2 is a plan view, and Figure 3 is a needle bar. Fig. 4 is a perspective view of the main parts, Fig. 5 is a plan cross-sectional view showing the operating state of the threading hook, and Fig. 6 shows another embodiment. FIG. FIG. 7 is a plan sectional view showing the operating state of a conventional threading hook. 1... Sewing machine frame, 3... Support shaft, 4... Needle bar support frame, 5... Needle, 5a... Eye hole, 6... Needle bar,
11...Threading rod support frame, 12...Pivot pin, 14
...Threading rod, 15... Operating member, 18... Operating member, 24... Threading hook, 30... Pulse motor (position setting device), 31... Rocking lever,
32...Connection rod, 33...Support pin, 36...Connection pin, 37...Connection bolt.

Claims (1)

[Claims for Utility Model Registration] A needle bar that is supported by a needle bar support frame that is swingable around a vertical axis and has a needle attached to its lower end; A threading rod to which a threading hook is fixed, and a threading rod supporting the threading rod so that the threading rod can rotate about its own axis and move up and down relative to the needle bar. A zigzag sewing machine comprising a support frame and a positioning device operable to set a pivot position of the needle bar, the needle bar support frame being pivotable about a vertical axis remote from a pivot axis of the needle bar support frame. a swing lever operatively connected to the position setting device; and a needle bar support frame provided to connect the needle bar support frame and the swing lever, one end of which is located on the axis of the needle bar. and the other end is connected to a portion on the swinging lever that is separated from the swinging axis of the swinging lever by a distance equal to the distance between the swinging axis of the needle bar support frame and the needle bar. and a continuous rod, and the threading rod support frame is fixed to the other end of the continuous rod in order to maintain a constant relative positional relationship between the eye of the needle and the threading hook. A zigzag sewing machine that can be threaded.